如何在不显着增加应用程序文件大小的情况下将 WMI 与 Delphi 结合使用? [英] How do I use WMI with Delphi without drastically increasing the application's file size?

问题描述

我使用的是 Delphi 2010，当我创建一个打印Hello World"的控制台应用程序时，它需要 111 kb.如果我想用 Delphi 查询 WMI，我会将 WBEMScripting_TLB、ActiveX 和 Variants 单元添加到我的项目中.如果我执行一个简单的 WMI 查询，我的可执行文件大小会跳到 810 kb.我

I am using Delphi 2010, and when I created a console application that prints "Hello World", it takes 111 kb. If I want to query WMI with Delp I add WBEMScripting_TLB, ActiveX, and Variants units to my project. If I perform a simple WMI query, my executable size jumps to 810 kb. I

无论如何要查询WMI而不增加文件大小?原谅我的无知，但为什么我用 C++ 没有这个问题?

Is there anyway to query WMI without such a large addition to the size of the file? Forgive my ignorance, but why do I not have this issue with C++?

这是我的代码:

program WMITest;

{$APPTYPE CONSOLE}

uses
  SysUtils,
  WBEMScripting_TLB,
  ActiveX,
  Variants;

function GetWMIstring(wmiHost, root, wmiClass, wmiProperty: string): string;
var
  Services: ISWbemServices;
  SObject: ISWbemObject;
  ObjSet: ISWbemObjectSet;
  SProp: ISWbemProperty;
  Enum: IEnumVariant;
  Value: Cardinal;
  TempObj: OLEVariant;
  loc: TSWbemLocator;
  SN: string;
  i: integer;
begin
  Result := '';
  i := 0;
  try
    loc := TSWbemLocator.Create(nil);
    Services := Loc.ConnectServer(wmiHost, root {'rootcimv2'}, '', '', '', '',
      0, nil);
    ObjSet := Services.ExecQuery('SELECT * FROM ' + wmiClass, 'WQL',
      wbemFlagReturnImmediately and wbemFlagForwardOnly, nil);
    Enum := (ObjSet._NewEnum) as IEnumVariant;
    if not VarIsNull(Enum) then
      try
        while Enum.Next(1, TempObj, Value) = S_OK do
        begin
          try
            SObject := IUnknown(TempObj) as ISWBemObject;
          except SObject := nil;
          end;
          TempObj := Unassigned;
          if SObject <> nil then
          begin
            SProp := SObject.Properties_.Item(wmiProperty, 0);
            SN := SProp.Get_Value;
            if not VarIsNull(SN) then
            begin
              if varisarray(SN) then
              begin
                for i := vararraylowbound(SN, 1) to vararrayhighbound(SN, 1) do
                  result := vartostr(SN[i]);
              end
              else
                Result := SN;
              Break;
            end;
          end;
        end;
        SProp := nil;
      except
        Result := '';
      end
    else
      Result := '';
    Enum := nil;
    Services := nil;
    ObjSet := nil;
  except
    on E: Exception do
      Result := e.message;
  end;
end;

begin
  try
    WriteLn('hello world');
    WriteLn(GetWMIstring('.', 'rootCIMV2', 'Win32_OperatingSystem',
      'Caption'));
    WriteLn('done');

  except
    on E: Exception do
      Writeln(E.ClassName, ': ', E.Message);
  end;
end.

更新:当我编译 以下来自 MSDN 的示例 使用 Microsoft Visual C++ 2008(控制台应用程序)，为 76 kb.

UPDATE: When I compile the following sample from MSDN with Microsoft Visual C++ 2008 (console application), it is 76 kb.

推荐答案

@Mick，使用 IBindCtx 和 IMoniker 接口.

@Mick, you can access the WMI without import the WBEMScripting from Delp using the IBindCtx and IMoniker interfaces.

检查这个简单的代码(在 Delphi 2010 和 Windows 7 中测试)，exe 文件大小为 174 kb.

Check this simple code (Tested in Delphi 2010 and Windows 7), the exe file size is 174 kb.

program WmiTest;

{$APPTYPE CONSOLE}


uses
  SysUtils
  ,ActiveX
  ,ComObj
  ,Variants;


function GetWMIstring(wmiHost, root, wmiClass, wmiProperty: string): string;
var
  objWMIService : OLEVariant;
  colItems      : OLEVariant;
  colItem       : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;

  function GetWMIObject(const objectName: String): IDispatch;
  var
    chEaten: Integer;
    BindCtx: IBindCtx;//for access to a bind context
    Moniker: IMoniker;//Enables you to use a moniker object
  begin
    OleCheck(CreateBindCtx(0, bindCtx));
    OleCheck(MkParseDisplayName(BindCtx, StringToOleStr(objectName), chEaten, Moniker));//Converts a string into a moniker that identifies the object named by the string
    OleCheck(Moniker.BindToObject(BindCtx, nil, IDispatch, Result));//Binds to the specified object
  end;

begin
  objWMIService := GetWMIObject(Format('winmgmts:\%s\%s',[wmiHost,root]));
  colItems      := objWMIService.ExecQuery(Format('SELECT * FROM %s',[wmiClass]),'WQL',0);
  oEnum         := IUnknown(colItems._NewEnum) as IEnumVariant;
  while oEnum.Next(1, colItem, iValue) = 0 do 
  begin
     Result:=colItem.Properties_.Item(wmiProperty, 0); //you can improve this code  ;) , storing the results in an TString.
  end;
end;

begin
 try
    CoInitialize(nil);
    try         
      WriteLn(GetWMIstring('.', 'rootCIMV2', 'Win32_OperatingSystem','Caption'));
      Readln;
    finally
    CoUninitialize;
    end;
 except
    on E:Exception do
    Begin
        Writeln(E.Classname, ': ', E.Message);
        Readln;
    End;
  end;
end.

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